package mddpra;


class Base3 {
    Base3() {
        System.out.print("Base父类");
    }
}

class Alpha3 extends Base3 {
    Alpha3(){
        System.out.println("Alpha子类");
    }
    public static void main( String[] args ) {
        new Alpha3();//1
        //调用父类无参的构造方法
        new Base3();//2
    }
}
